Messages in this thread | | | Date | Mon, 13 Dec 2010 12:02:51 -0500 | From | Rik van Riel <> | Subject | Re: [RFC PATCH 0/3] directed yield for Pause Loop Exiting |
| |
On 12/11/2010 08:57 AM, Balbir Singh wrote:
> If the vpcu holding the lock runs more and capped, the timeslice > transfer is a heuristic that will not help.
That indicates you really need the cap to be per guest, and not per VCPU.
Having one VCPU spin on a lock (and achieve nothing), because the other one cannot give up the lock due to hitting its CPU cap could lead to showstoppingly bad performance.
-- All rights reversed
| |